William d



(No Model.)

W. D. GRAY.

ROLLER GRINDING MILL.

Patented Apr. 6, 1886.

'n Huw f|| VILLAM D. GRAY, OF MILVAUKEE, VISOONSIN, ASSIGNOR TO E. P.ALLIS & OO., OF SAME PLACE.

ROLLER GRlNDlNG-VIILL.

DECFECATION forming part of Letters Patent No. 339,162, dated April 6,1886.

(No model.)

To all whom it may concern:

Be it known that I, WILLIAM D. GRAY, of Milwaukee, in the county ofMilwaukee and State of Vsconsin, have invented certain ImprovenientsinRoller Grinding-Mills, of which the following is a specification.

This invention consists in a peculiar construction and arrangement ofmechanism whereby the separation of the grinding-rolls i@ is caused toeffiect also the stoppage of the feedroll, and the closing of thegrinding-rolls is caused, on the other hand, to start the feedroll.

I have represented in the accompanying I 5 drawings a mill similar inits general construetion and mode of operation to those represented invarious Letters Patent of the United States hitherto granted to me, withthe exception of the present improvements, which are 2O embodiedtherein. For the purpose of illustration I have selected a millcontaining two pair of grinding-rolls and two feed-rolls, commonlydesignated in the art as a double roller-mill, the second feed-rollbeingdriven from the first i n an ordinary manner, forming no part of myinvention. Vhen applied to single mills, the same construction will beretained in every particular as far as the first pair of rolls isconcerned, but those additional parts whichhave special reference to asecond pair of rolls will ol' course be omitted.

eferring to the accompanying drawings, Figure l represents an elevationof a double roller-mill having my improvements embodied therein, lookingagainst the ends of the rolls. Fig. 2 is an elevation of the upper partof one side of the mill, looking in the direction indicated by the arrowin Fig. l. Fin'. 3 is a vertical section through one side of the 4o millon the line .fr a'. Fig. 4 is a side elevation ot' the hub by which thefeed-roll is disconnected.

A represents the frame or base portion of the machine, B B the twogrinding-rolls mounted in fixed bearings thereon, and O O thecooperating rolls mounted in supports D,whieh may be pivoted at theirlower ends, as shown, or otherwise arranged to permit the rolls O O tobe moved quickly to and from their comgo panions, in order that they maybe thrown into and out of position for grinding. The movable supports Dof each rollare connected adjustably to rods E, which latter have theiropposite ends mounted on eccentries F on a cross-shaft, G, arranged torock in fixed bearings on the frame. The two rock-shafts areprovidedwith crank-arms e, pivoted to a horizontal bar, H, by means of which theoperator is enabled to adjust the two movable rolls simultaneously.

The machine is provided, as usual, at the top with a hopper, I, havingtwo throats or outlets to deliver' the material to the grindingrolls.Beneath each of these throats there is a horizontal feed-rolLJ and J',to effect the 65 delivery of the material therefrom in a downwarddirect-ion to the grinding-rolls thereunder. The two feed-rolls areprovided on their ends with driving-pulleys K and L, connected by across-belt, M, whereby motion is 7o communicated from one roll to theother.

All of the parts above described, with the exception of the pulley L,are constructed and arranged to operate in the ordinary manner, and arenot claimed as of the present invention. The driving-pulley L ot' thefeedroll J is mounted on its shaft or journal in such manner as to slidelaterally thereon while compelled to rotate therewith. This connectionmay be effected by means of a 8o screwand slot, as represented in Fig.3, by a spline, or by other equivalent mechanism familiar to the skilledmechanic. The feedroll has its shaft or journal provided at the outerend with a second pulley, N, which re- 8 5 volves freely thereon, butwhich is fixed against side motion, a connection between the two beingmade by a screw and groove, as in Fig. 3. The hub of the pulleyN and theouter end of the hub of the pulley L are toothed or 9o serrated toengage each other, so that they form jointly a clutch by which motionmay be communicated from the pulley N to the feedroll. A spiral spring,O, is applied around the shaft of the feed-roll and inclosed within ahollow hub of the pulley L, bearing at one end against the hub and atthe opposite end against a collar on the shaft, as plainly representedin Fig. 3, whereby it is caused to hold the clutch devices normally inengagement. loo

'Ihe hub of the sliding pulley L is provided at the inner end with acircumferential flange, a, with which there engages a spiral iiange orrib formed on a hub, P, which is secured firmly to the end of one of therock-shafts G, by which the eccentrics are caused to adjust thegrinding-roll, as before explained. When the rock-shaft is turned toeffect the separation of the rolls, its flanged hub moves theclutch-pulley L inward out of engagement with the driving pulley N,thereby causing the feed-roll to stop at the same time that thegrinding-rolls are separated. As the second feed-roll is driven from therst, its stoppage occurs at the same time.

From the foregoing it will be readily understood that the movement ofthe bar H in one direction has the effect of spreading or separating thegrinding-rolls to stop the grinding action, and at the same time theeffect of stopping the feed-rolls. On the contrary, the movement of thebar II in the opposite direction will have the effect of starting bothof the feed-rolls and of bringing both pairs of grinding rolls to theiroperative position. Motion is communicated to the pulley N by means of abelt, R, passing thence to a pulley, T, which in this instance isapplied to one of the grinding-rolls, but which maybe applied to anyother suitable rotating part of the mill.

Vhile I have described herein a mill having two pairs of rolls, it willbe understood that the devices are applicable in like manner to singlemills, the bar H and all the devices on one side of the mill beingomitted and the adjustment of the parts effected by operating the arm e,which may be prolonged, if desired, beyond the length shown in thedrawings, although such prolongation is usually unnecessary.

I am aware that various mechanisms have been devised for the purpose ofeffecting simultaneously the stoppage of the feed-rolls and theseparation of the grinding-rolls, and the present invention isconsequently restricted to the peculiar construction and arrangement ofthe parts herein shown and claimed.

Having thus described my invention, what I claim isl. In a rollergrinding-mill, the combinag tion of the hopper, the stationary andmovable grinding-rolls, the feed-roll, the grindingroll-adjusting shaftprovided with a spiral flange, I), and a driving-clutch on the feedrollshaft engaged directly by the spiral flange, whereby the rotation of theshaft G in the proper direction is caused to effect the disengagement ofthe clutch.

2. In a roller-mill, the combination of a-

